CN109803743B

CN109803743B - Filter device, in particular for gas filtration, and round filter element

Info

Publication number: CN109803743B
Application number: CN201780064211.3A
Authority: CN
Inventors: P.内夫; N.多瑙尔; F.瓦格纳; T.弗里青
Original assignee: Mann and Hummel GmbH
Current assignee: Mann and Hummel GmbH
Priority date: 2016-10-17
Filing date: 2017-09-12
Publication date: 2021-11-02
Anticipated expiration: 2037-09-12
Also published as: CN109803743A; EP3854470A1; PL3854470T3; BR112019002427A2; EP3854470B1; EP3525910A1; DE102016012325A1; US20190308123A1; ES2867458T3; ES2946711T3; DE112017005243A5; WO2018072928A1; US11117082B2; EP3525910B1

Abstract

Disclosed herein is a filter device, such as an air filter, in particular for gas filtration, the filter device comprising a circular filter element and a filter housing (2) for receiving the circular filter element, the circular filter element comprising a filter media body (6), through the wall of which a fluid to be purified is flowable in a radial direction with respect to a longitudinal axis (8) of the filter media body (6). Furthermore, the filter device has end discs (9, 10) at oppositely situated end faces of the filter medium body (6), respectively, the original side is located in an internally situated flow space (7) within the filter medium body, and a support grid (30) is arranged at an outer wall of the filter medium body (6). The filter housing (2) comprises a housing cover (4), said housing cover (4) comprising flow guiding ribs (17) at the inner side, the flow guiding ribs (17) protruding into the flow space (7) of the circular filter element positioned inside. Furthermore, a circular filter element is disclosed having a filter media body through the wall of which a fluid to be purified can flow in a radial direction, the raw side being located in an internally positioned flow space in the filter media body and comprising a support grid at the outer wall of the filter media body.

Description

Filter device, in particular for gas filtration, and round filter element

Technical Field

The invention relates to a filter device and a round filter element, in particular for gas filtration, according to the preamble of claim 1.

Background

DE 102004053118 a1 discloses an air filter device for an internal combustion engine, which comprises a hollow-cylindrical filter element in a filter housing, wherein the air to be purified flows through the filter element from the inside to the outside in a radial direction. Air is directed into the interior of the filter media body of the filter element through the open axial end face and flows in a radial direction from the interior to the exterior through the wall of the filter media body. The cleaned air is then discharged from the air filter device through the outlet socket.

The filter element is placed onto an inlet socket which is located at the bottom of the filter housing and which in the mounted state projects into the interior of the filter element. The incoming air flows axially through the inlet spigot into the interior of the filter element and is then deflected in a radial direction for flow through the filter media body.

Disclosure of Invention

The invention has the object of implementing a filter device and a circular filter element with simple constructional measures, which comprises a flow space positioned inside and through which a fluid to be purified flows in a radial direction from the inside to the outside, such that a high filtration efficiency is ensured over a long period of operation.

This object is solved according to the invention with the features of claim 1. The dependent claims provide advantageous further developments.

The filter device according to the invention comprises a circular filter element and a filter housing for receiving the circular filter element. The circular filter element comprises: a filter media body through whose wall a fluid to be purified can flow in a radial direction relative to a longitudinal axis of the filter media body; further, the circular filter element includes end discs at opposite end faces of the filter media body, respectively. The raw side is located in an internally positioned flow space within the filter media body, and the support grid is disposed at an outer wall of the filter media body. The filter housing comprises a housing cover which at its inner side comprises flow guiding ribs which project into the flow space of the circular filter element which is positioned inside.

The filter housing includes a housing cover attachable to the filter housing base to enclose a receiving space within the filter housing base into which the filter element is inserted. Accordingly, at the inner side of the housing cover, flow guiding ribs, preferably in the shape of vanes, are arranged, which help to guide the fluid flow into the flow space positioned inside and during the filtration of the fluid, especially also for asymmetric or non-parallel flow conditions, to help a uniform particle loading of the filter element. The raw fluid is preferably directed from the outside in a radial direction towards the filter media body and then impinges at the inner side of the housing cover on flow guiding ribs which influence the impinging fluid flow, e.g. divide it into two and/or direct it in a direction towards the flow space of the filter media body located inside.

The circular filter element may be designed such that it has an open end disc comprising flow openings through which the flow guiding ribs protrude, wherein by means of or through the flow openings unpurified fluid is guided into an internally positioned flow space within the filter medium body.

The filter media body is preferably configured to be flowed through from the interior to the exterior in a radial direction.

According to a further preferred embodiment, a lateral flow opening is provided in the housing cover, which lateral flow opening is preferably embodied as an inflow opening and particularly preferably corresponds to a further inflow opening provided in the filter housing base, such that the inflow openings are above each other when the housing cover is attached.

In particular, the flow guiding ribs may have a curvature, preferably such that a fluid flow fed radially through the inflow opening of the housing cover is deflected by the flow guiding ribs in a direction towards the internally positioned flow space of the filter media body.

According to this embodiment, a transverse inflow opening for the fluid to be supplied is advantageously also provided in the filter housing base of the filter housing, wherein this inflow opening in the filter housing base and the transverse inflow opening in the housing cover are above one another in the mounted state and form a continuous flow path for the incoming fluid.

However, different embodiments of the flow guiding ribs can be envisaged. The flow guide ribs are embodied straight and positioned in a plane or, according to an alternative embodiment, curved. In the case of a straight configuration, the flow guide ribs may extend in the axial direction of the filter element, such that the wall surfaces of the flow guide ribs extend parallel to the longitudinal axis of the filter element.

Alternatively or additionally, it can be provided that the end face of the flow guide rib faces the flow opening in the housing cover. The flow guiding rib may be arranged in particular adjacent to the inflow opening in the housing cover, i.e. it may be positioned such that an end face of the flow guiding rib faces the inflow opening in the housing cover.

Fluid flow fed radially through the housing cap impinges on the flow directing ribs and experiences deflection in a direction toward an internally located flow space within the filter media body. Furthermore, the flow guiding ribs and the inflow opening may be arranged at least approximately parallel.

According to a further advantageous embodiment, the filter housing base is provided with a transverse outflow opening, which is preferably directed in a radial direction and through which the purified fluid can flow out. It may be advantageous for the outflow opening to be at least approximately parallel to the inflow opening and to the flow-guiding rib.

According to a further advantageous embodiment, in the mounted state, the filter element projects slightly axially beyond the end face of the filter housing base, so that removal of the filter element from the filter housing base (for example for service purposes) is facilitated. The seal carrier with the sealing element is positioned at a small axial spacing relative to the projecting end face of the filter element and provides a separation of the flow seal between the externally positioned section of the filter element and the internally positioned section of the filter element received in the filter housing base.

The circular filter element according to the invention is preferably used for gas filtration, for example for air filtration, in particular in the intake manifold of an internal combustion engine of a vehicle. The filter element comprises an annular closed filter medium body through the wall of which the fluid to be purified flows in a radial direction. The filter media body surrounds an internally positioned flow space bounded by an inner wall of the filter media body, wherein the inner wall forms an original side. Fluid to be purified is axially directed into the flow space positioned inside and flows through the wall of the filter media body in a radial direction relative to the longitudinal axis of the filter media body. The outer side of the filter media body forms a clean side through which the cleaned fluid exits from the wall of the filter media body. The axial end face of the filter medium body is covered by an end disc in a flow-tight manner. For axial flow delivery of fluid, one end disc includes a central opening communicating with a flow space positioned inside; however, the oppositely situated end discs are embodied in a closed configuration and externally close off the flow space situated inside in the axial direction.

Advantageously, the end disc of the filter element provided with the central opening is rounded at its radially inner side, thereby facilitating the flow of raw air into the interior in the filter media body. This in combination with the incoming flow into the interior of the filter element is particularly important for minimizing the total pressure loss when (as is preferred in this case) the air flows freely into the interior and (as is also preferred in this case) no flow duct is provided which directs the air flow directly into the interior. The radius of the rounded portion is advantageously greater at the radially inner side of the end disc than at the radially outer side. The radius at the radially inner side is implemented to be large enough as required so that the starting point of the radius at the end face is still within the contour of the filter media body. The radius of the rounded portion at the radially inner side of the end disc is for example in the range between 5 mm and 15 mm, for example 7.5 mm.

The circular filter element and the filter media body may be designed to be hollow cylindrical such that the flow space positioned inside is cylindrical. Further, embodiments are possible in which the circular filter element and filter media body are elongated and have an elliptical or ovalized cross-sectional shape. In the case of an elongate cross-sectional shape, a cross-sectional shape with parallel long sides and semicircular narrow sides is possible. Furthermore, concave or convex long sides with radially inwardly oriented protrusions or radially outwardly oriented protrusions can be envisaged. Preferably, the inner and outer walls of the filter media body extend concentrically with one another such that the filter media body has a constant radial thickness. Preferably, the inner and outer walls of the filter media body extend concentrically with one another such that the filter media body has a constant radial thickness.

According to a further advantageous embodiment, the circular filter element has a cross-sectional shape which tapers in the axial direction such that the outer circumference of the circular filter element in the region of the first end disc is of a different size than the outer circumference of the circular filter element in the region of the oppositely situated second end disc. In this embodiment, a circular cross-sectional shape in the region of the two end discs is also conceivable, so that the circular filter element and the filter medium body are embodied in a conical shape. Furthermore, it is possible to provide an oval or ovalized cross-sectional shape in the region of the two end discs, respectively.

In the case of a tapered cross-sectional shape of a circular filter element, the end discs at the end faces with the smaller outer circumference can be designed to be closed and axially close off the flow space positioned inside, while the oppositely positioned end discs at the larger outer circumference comprise flow openings for guiding the fluid into the flow space positioned inside.

Furthermore, the following embodiments are possible: wherein the end disc at the end face with the larger outer circumference is embodied to be closed and axially closes the flow space positioned inside, and the oppositely positioned end disc at the smaller outer circumference comprises a flow opening for guiding the fluid into the flow space positioned inside.

The circular filter element according to the invention comprises a support grid at the outer wall of the filter media body, which support grid is in particular designed to be shape-stable. The support grid is embodied, for example, as a thermoplastic injection-molded part. Due to the flow through the filter media body from the inside to the outside in the radial direction, the walls of the filter media body are subjected to a radially outwardly directed pressure under which they have a tendency to bend outwards. The support grid at the outer wall of the filter media body prevents the wall from deforming outwardly in the radial direction and thus maintains the shape of the filter media body during filtration, thereby avoiding deformation. Accordingly, the filter media body retains its original geometry over a long period of operation, and flow conditions are maintained during filtration of the fluid. Furthermore, the filter media body is subjected to a supporting action by the support grid at the outer side, so that the filter media body is subjected to a reduced load and the risk of damage of the filter media body is reduced. Advantageously, at least one end face (both end faces, as required) of the support grid is embedded in the end disc. The at least one end disc is preferably composed of a softer material than the support grid and the seal carrier at the filter element receiving the sealing element. Preferably, the end disc or discs are produced from a castable material, such as, by way of example and preferably, Polyurethane (PUR), in particular polyurethane foam.

The filter media body is preferably configured as a pleated filter having a plurality of filter pleats. The filter pleats preferably extend in or about the radial direction and thus in the flow direction and at the same time axially between the two end faces of the filter medium body. The pleated filter has an annular closed configuration.

In particular, exactly one filter media body embodied as a circular filter is arranged in the filter element.

According to a further advantageous embodiment, the shaped body protrudes into one end face of the filter media body and additionally stabilizes the filter media body and, in the embodiment as a folded filter, fixes the filter pleats in the desired position. In embodiments with a tapered cross-sectional surface, the shaped body is preferably located at the end face with a reduced cross-sectional surface. The shaped body may be implemented as one piece with the support grid at the filter media body, such that the support force acting on the end face of the filter element with the shaped body is distributed to the support grid by the shaped body and the support force of the end discs is released.

The outer contour of the shaped body advantageously corresponds to the outer contour and/or the inner contour of the filter medium body at its end face into which the shaped body protrudes into the filter medium body. It may be advantageous to connect the shaped body at least in sections thereof to an adjacent end disc, for example to form a support sleeve on the shaped body projecting into the end disc. The end disc into which the one or more sections of the shaped body protrude preferably has a closed configuration and flow-sealingly seals the interior in the filter media body. The shaped body may taper towards its free end face in a wedge shape as required, thereby simplifying and supporting the manufacturing process of the filter element. The shaped body is in particular embodied as an elongated body and extends between opposite sides of the support grid.

According to an advantageous embodiment, the circular filter element comprises a sealing element, in particular a circumferentially extending sealing ring, which is arranged on a seal carrier, which is embodied so as to be separate from the end disc and is arranged adjacent to the end disc at the raw side, through which end disc unpurified fluid is guided into the flow space positioned inside. In this context, the sealing element is positioned axially and radially at a spacing relative to the adjacent nearest end disc. By means of the sealing element, a separation of the flow seal of the original side from the clean side is achieved. Due to the arrangement in which the seal carrier is separate from the end disc, the end disc is not subjected to holding forces and sealing forces which, in the mounted state of the circular filter element, are absorbed by the sealing element and the seal carrier. Thus, the end disc remains unaffected by the retention and sealing forces. Due to the spacing of the sealing element and advantageously also the seal carrier in the axial and radial direction relative to the adjacent end disc, the seal carrier and the sealing element also have a spacing relative to the clean side or outer side of the filter medium body, so that fluid can exit via the clean side of the filter medium without being impeded by the seal carrier and the sealing element. The seal carrier is designed to be fluid-tight and advantageously connects the nearest end disk to the sealing element in a fluid-tight manner.

The seal carrier is axially spaced relative to the end face of the adjacent nearest end disc. The axial spacing is, for example, up to 30% of the axial height, preferably up to 20% of the axial height or up to 10% of the axial height, relative to the total axial height of the filter element.

According to a preferred embodiment, the seal carrier is arranged at the support grid. In particular, an integrated configuration of the support grid and the seal carrier, which are preferably embodied as plastic components, can be envisaged. The sealing and holding forces and the supporting forces are absorbed by the seal carrier and the support grid, respectively, while these forces of the filter media body are released.

According to a further advantageous embodiment, the seal carrier is configured as a circumferentially extending carrier wall extending at a spacing from an externally positioned wall surface of the filter media body. The carrier wall extends in particular parallel to the wall surface of the filter medium body located outside. The sealing element is advantageously inserted into a receiving groove in the carrier wall, wherein the receiving groove is preferably located at or adjacent to the end face of the carrier wall. The position of the sealing element at the carrier wall is at the end face of the carrier wall facing away from the most proximal disc.

In a preferred embodiment, the seal carrier or the carrier wall is connected sealingly tight, in particular at an end face of the seal carrier or the carrier wall facing away from the sealing element, and preferably sealingly tight with a form fit (form fit), to the end disc closest to the sealing element (i.e. the open end disc), in particular embedded therein or glued thereto. In the case where the seal carrier and the support grid are formed as one piece, the cells of the seal carrier and the support grid may preferably be connected to the two end discs, respectively, by embedding the respective end face ends in the respective end discs, respectively, such that the end face ends of the seal carrier and the support grid are embedded in the end discs with a form fit.

In the installed position, the seal carrier is advantageously supported at the housing part, for example at an internally positioned shoulder in the filter housing base, which receives the filter element and to which the housing cover can be attached.

At the end face, in particular at the top side of the seal carrier, projections (knobs) can advantageously be integrally formed as required with an axial spacing relative to the end face. These projections have the effect of tolerance compensation and can compensate for deviations of the seal carrier relative to a planar surface for attaching the housing cover and/or placing onto a shoulder in the filter housing base. The projection is, for example, rod-shaped and positioned parallel to the side wall of the seal carrier; the rod-shaped projection extends, for example, in the radial direction. In the installed position, the projection is pressed into the material of the housing part and/or the projection is in particular elastically or plastically deformed and thus compensates for tolerance deviations. Preferably, a material that is softer than the material used for the housing part (in particular the housing cover) is selected for the projection, so that the deformation is substantially or completely effected by the projection.

According to another embodiment, in particular relating to a circular filter element having a cross-sectional shape that tapers in the axial direction, the smaller end disc comprises a radially protruding support cam. Advantageously, the supporting cam does not protrude further in the radial direction than the inner or outer contour of the oppositely situated end disc or of the oppositely situated seal. However, a slight bulge may be provided in order to achieve a particularly strong clamping action. The inner contour of the seal carrier and/or of the sealing element advantageously extends substantially along the outer circumference of the larger end disk in the radial direction.

In the case of an oval or ovalized cross-sectional shape of the filter medium body, the supporting cams are preferably located at the long sides and are arranged in particular at the end discs, preferably at the smaller end discs, in particular are embodied as one piece together with the end discs and are integrally formed at said locations. However, it is also possible to additionally arrange one or several cams at the end disc at the narrow side. The cam protrudes in the radial direction beyond the end disc and preferably supports the circular filter element at the received filter housing in the mounted state.

Drawings

Further advantages and advantageous embodiments can be derived from the further claims, the description of the figures and the figures. In which it is shown that:

fig. 1 shows a filter device for gas filtration in an exploded view, having a filter housing base, a filter element and a housing cover;

fig. 2 the filter device in a mounted state in a perspective view;

FIG. 3 is a perspective view of the filter element from above;

FIG. 4 is a perspective view of the filter element from below;

FIG. 5 is an interior view of the housing cover with flow directing ribs at the interior side of the housing cover;

fig. 6 is a sectional view of the filter device in the region of the housing cover in a perspective view;

figure 7 is another cross-sectional view of the filter device.

In the drawings, like parts are provided with like reference numerals.

Detailed Description

In fig. 1, 2, 6 and 7, a filter device 1 is shown, preferably for gas filtration, in particular for air filtration in the intake manifold of an internal combustion engine. The filter device 1 includes: a filter housing 2, said filter housing 2 comprising a filter housing base 3 and a housing cover 4; and a filter element 5 insertable into the filter housing base 3. The housing cover 4 closes a receiving space in the filter housing base for receiving the filter element 5.

As can be seen in fig. 1, 3 and 4, the filter element 5 is provided with a filter media body 6, in which the filtration of the fluid to be purified takes place. The filter element 5 is configured as a circular filter element; correspondingly, the filter medium body 6 is also embodied as a circular element which surrounds an internally positioned flow space 7, into which flow space 7 the fluid to be purified is conducted. The fluid is guided into the flow space 7 axially with respect to the longitudinal axis 8 (fig. 1) of the filter element 5 and the filter device 1. Subsequently, the fluid flows through the wall of the filter media body 6 in a radial direction from the inside to the outside. Accordingly, the inner wall of the filter media body 6 is the original side, and the outer wall is the clean side.

The filter element 5 and the filter media body 6 comprise a strongly ovalized shape with two long sides extending in parallel and a semicircular narrow side. Furthermore, the filter element 5 has a conical basic shape, wherein the axially oppositely situated end faces of the filter element 5 are of different sizes and have different sizes of outer circumference. The axial end faces of the filter medium body 6 are covered in a fluid-tight manner by

respective end discs

9, 10, wherein the end disc 9 at the larger end face of the filter element 5 is embodied to be open and comprises a flow opening 11 through which the raw fluid can flow into the flow space 7 positioned inside. On the other hand, the oppositely situated end disk 10 is embodied so as to be closed, as can be seen in fig. 4, that the flow space 7 situated inside is also closed axially at this side.

At the closed end disc 10, a cam 12 is integrally formed, said cam 12 extending radially in the outward direction and being positioned adjacent to the narrow side at the long side. The cam 12, which is formed in one piece with the end disc 10, supports the filter element 5 in the mounted state at the filter housing base 3. In the radial direction, the cam 12 preferably does not protrude further than the oppositely situated larger end disc 9, in particular in the mounted state.

At the outer wall of the filter medium body 6, there is a support grid 13, which support grid 13 is in particular made of plastic material and is embodied so as to be separate from the

end discs

9 and 10. The support grid 13 supports the filter media body in a radial direction at the outer wall of the filter media body. Due to the radial flow through the filter media body 6 from the inside to the outside, outwardly directed pressure is generated in the filter media body, which outwardly directed pressure is absorbed by the support grid 13. This ensures that the filter media body 6 is not deformed by the pressure of the fluid flowing therethrough.

Adjacent to the end disc 9, which is provided with flow openings 11 for guiding the raw fluid, there is a seal carrier 14, which supports a sealing element 15. The seal carrier 14 is designed as a circumferentially extending carrier wall which is positioned in a plane perpendicular to the longitudinal axis 8 and is preferably embodied in one piece with the support grid 13. The seal carrier 14 is arranged at a minimum axial spacing relative to the top end disc 9 and at a significantly greater axial spacing relative to the bottom end disc 10. The outer perimeter of the seal carrier 14 has a greater radial extent than the outer wall of the filter media body 6.

The sealing element 15 is designed as a sealing ring which is preferably inserted into a receiving groove in the end face of the carrier wall 14 at the side facing away from the adjacent end disc 9. The sealing element 15 faces away from the nearest end disc 9 and faces the oppositely situated end disc 10 and rests in the mounted state on a circumferential shoulder 16 (fig. 1) at the inner wall of the received filter housing base 3. The shoulder 16 is axially positioned at a spacing relative to the upper end face edge of the filter housing base 3.

The following description relates to the housing cover 4, the housing cover 4 including a blade-shaped flow guide rib 17 at an inner portion thereof (see fig. 5, 6, 7). The flow guide ribs 17 are in particular straight and positioned in a plane and, as shown in fig. 6 and 7, extend axially into the internally positioned flow space 7 within the filter element 5 in the mounted state. The flow guide ribs 17 are embodied in one piece with the housing cover 4.

A transverse inflow opening 19 is provided in the housing cover 4, through which transverse inflow opening 19 the raw fluid flows radially into the filter device. The inflow opening 19 in the housing cover 4 corresponds to a further inflow opening 20 provided in the filter housing base 3. When the housing cover 4 is attached, the

inflow openings

19 and 20 are above each other, so that a continuous flow path for the original fluid is formed. The end face 18 of the flow guiding rib 17 faces an inflow opening 19 in the housing cover 4. The flow guide ribs 17 are positioned centrally, in particular, at the inner side of the housing cover 4, so that the raw fluid fed radially is divided by the blade-shaped flow guide ribs 17 and also experiences an improved axial flow transport in the filter medium body 6 in the direction of the flow space 7 positioned inside.

As shown in fig. 1, 2 and 7, there are lateral radial outflow openings 21 provided at the filter housing base 3 for discharging the purified fluid. The longitudinal flow axes of the

inflow openings

19 and 20 on the one hand and of the discharge opening 21 on the other hand extend at least approximately parallel. The plane of the flow guiding element 17 may also extend approximately parallel to the longitudinal flow axis of the inflow and outflow openings, although embodiments with a non-parallel arrangement of the flow guiding element 17 with respect to the

openings

19, 20 and 21 and a non-parallel arrangement between the

inflow openings

19 and 20 and the outflow opening 21 are also possible.

As can be seen in fig. 7, in the bottom region of the filter element 5, adjacent to the bottom end disc 10, there is provided a shaped body 22, said shaped body 22 being formed in one piece, in particular together with the support grid 13. The shaped body 22 protrudes axially into the internally positioned flow space 7 within the filter media body 6 and provides stability of the filter media body 6 (embodied as a pleated filter). The shaped body 22 tapers in a wedge shape towards its open end face and comprises in a central region a lowered support sleeve 23 projecting into the bottom end disc 10. The radially outer section of the shaped body 22 also projects into the end disc 10, thereby achieving a fixed connection between the shaped body 22 and the bottom end disc 10. The shaped body 22 has an at least substantially straight configuration and extends in the longitudinal direction of the filter media body 6. The radially outer section of the shaped body 22 is connected to the support grid 13 so that the supporting and holding forces are absorbed by the shaped body 22 and the bottom end disc 10 is released.

As can be seen in fig. 7 in conjunction with fig. 4, an annular support member 24 is integrally formed centrally on the bottom end disc 10 at the side facing axially away from the flow space 7 positioned inside, with which annular support member 24 the filter element 5 can be placed onto a support sleeve 25 associated with the housing. The support sleeve 25 is located at the bottom of the filter housing base 3. The annular support member 24 has an elongated cross-sectional shape.

As can also be seen in fig. 7, the

inflow openings

19 and 20 are positioned such that the end faces of the top end disc 9 form a continuous profile at the same level as the

inflow openings

19 and 20. The downwardly inner sides of the

inflow openings

19 and 20 are located axially at the same level as the externally located end faces of the top end disc 9. In this way, an unobstructed inflow of the original fluid is ensured.

As can be seen in fig. 7 in combination with fig. 3, the top end disc 9 is provided at its side facing the central opening positioned radially inwards with a rounded portion 26, said rounded portion 26 facilitating the inflow of the original fluid into the flow space 7 positioned inwards. The radius of the radiused portion 26 is greater at the radially inner side of the end disc 9 than at the radially outer side of the end disc 9.

Claims

1. Filter device for gas filtration having a circular filter element and having a filter housing (2) for receiving the circular filter element, wherein the circular filter element comprises a filter medium body (6), through the wall of which filter medium body (6) a fluid to be purified can flow in a radial direction relative to the longitudinal axis (8) of the filter medium body (6), at oppositely situated end faces of which filter medium body (6) there are respectively end discs (9, 10), wherein the original side is located in an internally situated flow space (7) within the filter medium body (6) and a support grid (13) is arranged at the outer wall of the filter medium body (6), characterized in that the filter housing (2) comprises a housing cover (4), the housing cover (4) comprises at the inner side a flow guiding rib (17), which flow guiding rib (17) protrudes into the flow space (7) of the circular filter element positioned inside, a transverse inflow opening (19) is provided in the housing cover (4), an outflow opening (21) for discharging purified fluid is provided at the filter housing base (3), which flow guiding rib (17) extends parallel to the longitudinal flow axis of the inflow opening (19) and the outflow opening (21).

2. A filter device according to claim 1, wherein the circular filter element has an open end disc (9), the open end disc (9) comprising a flow opening (11), the flow guiding rib (17) protruding through the flow opening (11).

3. A filter device according to claim 1, c h a r a c t e r i z e d in that the filter media body (6) is capable of being flowed through in a radial direction from the inside to the outside.

4. A filter device as claimed in any one of claims 1 to 3, characterized in that a further inflow opening (20) is provided in the filter housing base (3) such that the inflow opening (19) is located above the further inflow opening (20) when the housing cover (4) is attached.

5. A filter device as claimed in claim 4, characterised in that the flow guiding rib (17) comprises a curvature such that a fluid flow fed radially through the inflow opening (19) of the housing cover (4) experiences a deflection by the flow guiding rib (17) in a direction towards the internally positioned flow space (7) of the filter media body (6).

6. A filter device as claimed in any one of claims 1 to 3, characterised in that an end face (18) of the flow guiding rib (17) faces the inflow opening (19) of the housing cover (4).

7. Circular filter element for a filter device according to any one of claims 1 to 3, wherein the circular filter element comprises a filter medium body (6) through the wall of which (6) fluid to be purified can flow in a radial direction with respect to the longitudinal axis (8) of the filter medium body (6), end discs (9, 10) at oppositely located end faces of the filter medium body (6), respectively, wherein the original side is located in an internally positioned flow space (7) within the filter media body (6), and a support grid (13) is arranged at the outer wall of the filter media body (6), wherein one end disc (9) comprises a central opening which communicates with the flow space positioned inside and is embodied such that a flow guiding rib can protrude through said central opening.

8. The circular filter element according to claim 7, characterized in that a sealing element (15) is arranged at a seal carrier (14), which seal carrier (14) is embodied separate from the end discs (9, 10) and arranged adjacent to the raw air side and/or the open end disc (9), wherein the sealing element (15) is positioned at an axial and radial spacing relative to the adjacent end disc (9).

9. The circular filter element according to claim 8, characterized in that the seal carrier (14) is arranged at the support grid (13).

10. The round filter element according to any of claims 8 to 9, characterised in that the seal carrier (14) is embodied as a circumferentially extending carrier wall which extends at a spacing from an externally located wall surface of the filter medium body (6), and that the sealing element (15) is arranged on an end face of the circumferentially extending carrier wall facing away from the nearest raw air side and/or open end disc (9).

11. A circular filter element according to claim 10, characterized in that a receiving groove for the sealing element (15) is provided in the end face of the carrier wall facing away from the nearest end disc (9).

12. The circular filter element according to claim 10, characterized in that the end face of the carrier wall facing the nearest raw air side and/or open end disc (9) is tightly sealingly connected with this end disc (9).

13. A circular filter element according to any of claims 8 to 9, having a cross-sectional shape that tapers in the axial direction.

14. A circular filter element according to claim 13, characterized in that at the smaller end disc (10) radially protruding support cams (12) are integrally formed.

15. The circular filter element as claimed in claim 14, wherein the support cams (12) do not protrude radially further than the inner or outer contour of the oppositely situated end disc (9) or of the oppositely situated seal.

16. The circular filter element according to any of claims 8 to 9, characterized in that the filter media body (6) comprises an oval or ovalized cross-sectional shape and/or support cams (12) are integrally formed at the long sides of the end disc (10).